Plaster board



J1me 1931- M. s. WUNDERLICH 1,308,976

PLASTER BOARD Filed June 16, 1930 6 In ven far Milton .Wunderlzk:

Patented June 9, 1931 MILTON S. W'UNTDERLIGH, OF ST. PAUL, MINNESOTA, ASSIGNOB vI'D FLAXLINUM IN- SULATUG comm, OF ST. PAUL, MINNESOTA, A CORPOBATIONQF MINNESOTA rnasrnn 30am) Application filed June 16,

This invention relates to a plaster and insulating board. In the structure of modern buildings, where plaster or-similar sub stance is to be placed on a wall, various 1kinds of lathing are used. It is alsocommon practice to use insulating or wall board of difierent kinds. It is also common practice to use expanded metal lath and this is generally nailed directly to the sheeting or g to the studding. It has been proposed to make a plaster board having lath thereon and one form of such board is shown in the patent to Ellis 1,126,186, granted January 26th, 1915. The need has been felt for a 16 plaster board which wouldhave insulating qualities, which would have means for preventing the plaster coming in direct contact with the insulating board, and which would have a plaster receiving and holding layer or 20 lath thereon of metal, rendering the board flexible in all directions or in directions at right angles to each other, and which would permit a uniform application of the plaster. it will be seen that the plaster board, such as shown in the Ellis patent above re- :"erred to is not flexible in all directions, nor in directions at right angles to each other, and that the plaster will not he uni= formly disposed relative to the heard, as so the lath coversup quite a large area of the board. Thisdi'derence in the surface under the plaster and the dih erence in the thicle ness of the plaster layer is very apt to cause craclrs in the plaster and to prevent the uniform hardening of the plaster, t is an object of this invention, therefore, to provide a plaster board having a plaster receiving and holding layer, together with an insulating layer, which board is flexible in substantially all directions and particularly in directions right angles to each other.

it is a further object of the invention to provide plaster board which is flexible and which has an eficient means for receiving and holding the plaster thereon, and on which the plaster can be uniformly placed in relation to the insulating layer or its covering. 60 It is still another object oi the invention was. Serial in. 461,571.

and a uniform metal layer of plaster receiv- 1 .ing and holding material of integral and uniform formation together with means for fastening all of said layers to ether. y

it is more specificall an ob ect of the invention to provide a p aster board comprising a layer of fibrous insulating material of sufiicient rigidity to retain its shape and be handled as a board butyet which is capable of being flexed, a layer of water proof paper covering said layer, and a layer of expanded metal lath covering said paper, together with means passing throughalloi the layers for securing them together. 'lhe layer of expanded metal lath preferably projects a short distance on the blocks or sheets of the board at two edges thereof, the sheets preferably heing square or rectangular.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accompanying drawings, wherein like reference characters refer to similar parts throughout the several views and wherein,

Fig.1 is a perspective view oi hloclr or sheet of the material constituting the present invention;

Fig. 2 is a perspective view of a piece ot the material, the same being inverted and showing the plaster attached thereto, some parts being broken away;

Fig. 3 is a vertical section through a por-' tion of the sheet shown in Fig, i; and

Fig. 4% is view similar to Fig. 3, showing a modified term of the invention.

Referring to the drawings, a plaster board 18 shown comprising an inner or hottom lay= er 5, which is formed of fibrous insulating material, While any form of fibrous insulating material may be used, preferably, and in the embodiment of the invention illustrated, the layer 5 is formed of felted fibers, of such material as shredded straw, corn stalks, hemp, excelsior shavings, and the like. Such felted sheet is disclosed and claimed-in Letters Patent 908,681, granted to James E. Lappen, January 5th, 1909. The layer 5 is sufiiciently rigid to retain its shape and be handled as a sheet or board but isflexible in various directions and is some -what yielding.f The material also comprises a water proo cing 6 overlying the layer 5. While the facing 6 can be variously formed, in the embodiment of the invention illustrated, it is shown as a thin sheet of water [proof paper. While any good grade of water roof building paper may be used,

prefers ly a fairly heavy paper, known to the trade as Neponsit 1s used. The sheet 6, of course, is quite flexible and 'bendable in any'direction with la er 5. The material also com rises a thir layer 7 which is formed 0 the well known expanded metal lathing. This material is formed by slitting a sheet of metal and then drawing the metal to expand it at the slitted portions, thus forming a series of polygonal openings. The

lathing has a sort of honeycomb structure and is of appreciable thickness, the kind preferably used being between one-sixteenth of an inch and. one-eighth of an inch in thickness. The three layers 5, 6 and 7 are a The material is preferably made in square or rectangular sheets.

In operation, the board may be tacked to the sheeting or studding, where the wall is to be made, and the layer 7 will be enter- 9a and outer finishin most. The plaster is then applied to the outer layer 7. The metal lathing 7 is well adapted for receiving. and holding the plaster and has proven very efiicient for this purpose in practice. The plaster layer on the material is shown as 9 in'Fig. 2, the same being shown as having a rough'coat or layer coat- 9b. Owing to the yielding nature 0 layer 5, and sheet 6, and to the fact that the fasteningmeans 8 are spaced, the plaster finds its way to the inner side of the layer 7 and substantially covers the lath so that a smooth surface 10 is formed at the inner side of the layer 7 adjacent the paper layer 6. This feature of the plaster passlng through the metallic lath causes the lath to be self-furringThis is of. great im rtance as it insures-a very secure.

and efficient bond for the-plaster and the layer 5 is com letel enclosed. It will also be noted that y using the expanded metal lath, the plaster isuniformly applied to the lath.

be used where the insulating; 1

' efiicient plaster boar 6 as the is "uniformin said layer The layer is an integral piece and a very uniform layer of plaster and base,

therefore, is thus obtained. 'This .insures that the plaster will dry uniformly and the tendency to crack is practically eliminated.

The board, as stated, is quite flexible and can thus be readily attached, to surfaces which are not 1 in in one plane. A close fit can "thus be a between the board and itssupporting surface. This is a great advantage as it is often necessary to flex the plaster board somewhat in its application.

With a board having rigid'lath thereon this 'is'i-mpo'ssible. Layer 5 is formed with depressions in its surface, illustrated as'hav-.

mg the form of a frustum of a pyramid. These form air spaces when covered by the layer 6.

- In Fig. 4 a modified form of the invention is shown, in which a layer 10 of specially formed self-furring expanded metal lath is used. This will be similar in form to the layer 7 shown in Fig. 1 already described, but the same is pressed to have transversely extendin ribs 10a. These ribs will contact the a er 6 of aper which overlies the la er 5 o insulating material. Layer 10 W111 be secured by suitable fastening means such as sta les 11 extending therethrough and throng material 13. With such a form of metal lath, the plaster can pass to the rear thereof and the metal lath will be embedded in the-plaster. Such a self-furring lath will material is not yieldin With the yiel n material as describe 'in, connection with i 1, 2 and 3, the self-furring effect is o tained without having the lath spaced from the sheet 6.

From the above. description, it is seen that applicant has provided a simple and and one com rising a new combination of elements. T e board has many advanta es over the previous plaster boards whic have been proposed. t forms a simple and eflicient article of manufacture and serves the double duty of insulating board and lath. The material is flexible as stated, is easily and inexpen-' sively made and can be easily and effectively apphed. As stated, the layer of expanded metal lath is disposed within the plaster and between the plaster and the layer 6 or the waterproof facing- The metal is thus covered throughout its whole extent and is not subject to moisture, or to any circulation of air. This prevents any rusting or corrosion of the metal and adds to the life of the structure. Tests of building construction have shown that air under pressure, as in a high wind, will pass through rough plaster. However, should any air 05 the layer 12 of waterproof paper and through the layer of insulating The material has been amply demonstrated in actual practice and found to be very efiicient and successful, and is being commercially made.

It will, of course, be understood that various changes may be made in the form, details, arrangement and roportions of the parts without departing rom the scope of applicants invention, which, generally stated, consists in a material, capable of carrying out the objects above set forth, such as disclosed and defined in the appended claims.

What is claimed is 1. 'A plaster board comprising a comparatively thick layer of insulating material, a

thin water proof sheet overlying said layer,

a layer of expanded metal lath overlying said sheet and means extending through and securing said layers and sheet to ether.

2. A composite lath and heat insulating material, comprising a felted flexible insulating layer and a flexible layer of expanded metal lath secured thereto, said material being flexible. I

3. A composite lath and heat insulating material comprising a flexible insulating body layer, a water proof facing sheet applied thereto, a layer of expanded metal lath secured thereto and metallic fastening members extending through all of said layers and securing the same together.

4. A composite lath and heat insulating material, comprising a flexible insulating body layer, a water proof sheet of thin material overlying said sheet, an integral sheet of expanded metal lathing overlying said layer and fastening means extending through said three elements for holding the same together.

5. A composite lath and heat' insulating material, comprising a yielding layer of fibrous insulating material, a water proof facing applied to said layer and overlyin the same, a layer of flexible expanded metal overlying said facing and spaced means for holding said layers together whereby in the application of plaster to said expanded metal, said first mentioned layer will yield and allow said plaster to pass to the rear of sheet metal layer thus forming an efiicient bond.

6. A compositelath and heat insulating material, comprising a comparatively thick layer of insulating material, a layer of expanded metal lathing overlying said layer, and spaced means extending through said layers and fastening the. same together.

7. A flexible composite lath and heat insulating material comprising a comparatively thick and bendable layer of fibrous insulating material, said layer having depressions formed in its surface, a sheet of water proof aper overlying said layer and covering said depressions thus forming air cells, a layer of expande metal lathing overlying said sheet, and means holding said'layers and sheet together.

8. A wall structure including a layer of yielding fibrous insulatin material, a sheet of water proof and air tig t paper overlying said layer, a uniform layer of expanded metal lathing overl 'ng said sheet, and a layer of plaster em edding said last mentioned layer and engaging said sheet, whereby said layer of metal lathing is enclosed between the plaster and said air tight sheet and circulation of air through said wall is prevented. a

9. A composite lath and heat insulating material comprising a comparatively thic layer of yielding insulating material, a layer of expanded metal lathing overlying said layer, and spaced means extending through said layers and fastening the same together, said layer of expanded metal lathing being self-furring.

10. A composite lath and heat insulating material comprising a flexible layer of fibrous insulating material, a waterproof and airproof thin sheet of material overlying said layer, anintegral layer of expanded metal lathing overlying said sheet, and spaced metallic fastening means extending through said three elements for holding the same together.

MILTON S. WUNDERLICH.

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